Apparatus for shaping metal articles.



H. HAHN. MEARA'IUS FOR SHAPING METAL ARTICLES.

APPLIUATION FILED FBB.B,1912.

Patented Apr. 23, 1912.

HEBMANN MEN, OF CHABLOTTENBUBG, GERMANY.

APPARATUS FOR SHAPING- METAL ARTICLES.

Specification of Letters Patent.

Patented Apr. 23, 1912.

Application filed February 8, 1912. Serial No. 676,875.

To all whom it may concern:

Be it known that I, HERMANN RAHN, a citizen of the Empire of Germany, and residing at Charlottenburg, near Berlin, Germany, have invented certain new and useful Improvements in Apparatus for Shaping Metal Articles, of which the following is a specification.

- My invention relates to apparatus for shaping metal articles.

The shaping of thin rotating bodies, for example disks, by pressure has heretofore been done by the operator securely holding the tool freely on a support. When the disks are large the operator must support himself firmly against a prop connected with the lathe. This known process has important defects attached to it. It is very slow and involves the exertion of great bodily force. Also, great skill is necessary. Even this, however, does not protect the operator from injury particularly because in the customary process his free left hand must guide a support and prevent the outer edge of the workpiece from vibrating too severely before it bears on the former; scars due to serious injuries ofthis hand are therefore considered, as it were, characteristic of the calling. Further, on account of the danger connected with it, work-pieces bulged out of sha 6 cannot be worked up further.

N ow a primary object of my invention is to provide an improved process and appara.- tus for carrying the same into practice to which these defects are not attached. 7

To this end, my invention substantially consists in using two two-armed levers, the one provided with the tool and freely gulded being used for shaping the work-piece,wh1le the second exercises the requisite presure independently of the first. The lever carrying the tool can thus be guided along the workpiece substantially independently of thesec- 0nd lever. This independent adjustab'llity of the tool-lever makes the apparatus characteristically different from apparatuses known heretofore in spinning machines.

In order to enable my improved process to be executed by only one o erator, accofding to my invention I provi e for the workpiece a mechanical support in the form of a spring-pressed roller or the like so that, in contradlstinction to the well-known proc esses, the left hand of the operator is free for guiding the second lever.

Some illustrative embodiments of my invention and modifications thereof are represented by way of example in the accompanying drawing, wherein Figure 1 is a top plan view showing part of a lathe, partly in section, a single palr of two-armed levers, and the support provided according to the invention for the outer edge of the work-piece; Fig. 2 is a like view showing a modified form of a pair of levers only, the end of the resser-lever being formed as adisk, Fig. 3 a section taken on 'the line E-F in Fig. 2 through the presserlever and the disk portion thereof, and Fig. at a side elevation of the tool-lever shown in Fig. 2; Fig. 5 is an elevation of part of a tool-lever specially adapted for shaping soft metal, and Fig. 6 1s a like View of a modified form of the lever shown in Fig. 5.

Referring firstly to Fig. 1, the simplest apparatus for carrying my process into practice is here shown. a designates the presser-lever fulcrumed on a ivot e secured ina rest '11. firml connected w1th the franie D of the lathe in icated by cross-hatching. e designates the tool-lever carrying at its one endthe tool to which may have the form of a roller as shown in the drawing. It is as universally revoluble as possible, it being rotatable about a pivot j mounted revolubly in the pressure lever a as in a universal joint. Each lever is provided with a handle f. The other parts shown in the figure illustrate how the improved apparatus is used. u is the former or die. It is driven by a grooved pulley b which is fast on the shaft L carrying the former a and journaled in the frame D. s designates the work-piece, a thin sheet of metal held by nuts t in front of the-former u. p designates the su port, provided according tomy invention, or supporting the work-piece at its outer edge. in a bearing 9 provided on the frame D and is under the action of a spring 1'.

It is movably mounted The arrangement according to Fig. 2 is for rendering the improved process capable of being employed in as many ways as possible. Here a g designate the presser-lever which is formed at its end serving for guiding the tool-lever e as a disk 9 which, in the illustrative embodiment, is a circular eccentric and is provided both with holes ifor receiving the pivot j of-the tool-lever e, and also with screw-threaded holes is for receiving the part a (Fig. 3). This arrangement enables not only the presser-tool to be guided along the work-piece s in any required-curve, and the magnitude of the pressure to be made greater or less at any moment independently of the guiding of the tool, but also the ratio of transmission at the presser-lever to be varied considerably. For the latter purpose the holes 6 for the pivot of the tool-lever are provided at various distances from the center of rotation h of the eccentric disk g.

Fig. 4 shows the tool lever 6 provided with a number of notches or recesses m. It \requires to be only loosely rested on the pivot Z in the fork d. This has two advantages: Firstly, not only can changesin the ratio oftransmission be made at the toollever, but also, which is perhaps more important, changes in length between the work-piece and the fulcrum l of the toollever can likewise be made with the greatest ease, and, secondly, the apparatus is consid erably safer in working because should the tool w unexpectedly catch in the work-piece the tool-lever e will generally rise from the pivot Z without causing any damage.

In Fig. 5 is shown a tool-lever in which the recesses m just described have the form .of annular grooves o concentric with the axis of the lever. Also the lever e is provided with a tool 4; which, in contradistinction to the roller w shown in Fi s. 1, 2 and 4, is firmly connected with the ever 6 and thus can not move relativel' thereto. Such tool-levers can be arbitrar' yrotated about the axis of the tool or by the friction on'the work-piece. They are requisite for working soft sheet-metal,- e. g. of brass, copper, tin. Thetool 'v is preferably exchan eably mounted in the lever e, as indicated y the cotter 'y in the drawing, so that the levere solely serves as a tool holder. Both grooves and notches may, of course, be provided in one and the same lever, and the same lever may be adapted by means of a slot in the head w for tools of the type of the roller w, as indicated by the slot 2. in Fig. 6. The arrangement according to Fig. 6 1s accordingly that of a universal presser-tool.

I c aim 1. In a paratus for shaping thin rotating metal bo ies by pressure, the combination with a frame for carrying the rotating body ing located within the perip recessed, manually gui tool-lever fulcrumed on the metal bodies roaaaea to be shaped, of a suitably supported manual presser lever and a manually guided tool lever fulcrumed on the presser lever.

2fln apparatus for shaping thin rotating metal bodies by pressure, with a frame for carrying the rotating body to be shaped, of a manual presser-lever comprising a handle at one end and a dlsk portion at the other fulcrumed on the frame, the fulcrum of the presser-lever being 10- the combination,

cated within the periphery of the said disk,

and a manually guided tool-lever fulcrumed on the said dis 3. In apparatus. for shaping thin rotat- 7 ing metal bodies by pressure, the combination, with a frame for carrying the rotating bodyto be shaped, of a mariualp'ressenlever comprising a handle atone end and a disk portion at the other fulcrumed on the frame, the fulcrum of the presser-leverbecry of the said disk, the said disk havin a plurality of holes at various distances cm the fulcrum of the presser-lever, and a manually 'ded tool-lever detachabl and exchangeab y fulcrume'd in one of t e holes'in said disk. 4. In apparatus for shaping thin rotating metal bodies by pressure, the combina-' tion with a frame for carryin the rotatin body to be shaped, of a suite ly supports manual presser ever and a manually guided tool lever readily detachably fulcrumed on the presser lever. 5. In ap aratus for shaping thin rotating metal dies by pressure, the combination, with a frame for carrying the rotating body to beshaped, of a manual presserlever fulorumed on theframe, a p1vot rotatably mounted on theresser-lever, and a ded tool-lever fulcrumed on said pivot, said pivot entering into a recess in the tool-lever.

6. In ap aratus for shaping thin rotating metal libdies by pressure, the combina tion, ,with a frame for carrying the rotating body to be shaped, of a manualpresserlever fulcru'med on the frame, a pivotrm tatably mounted on the presser-lever, and an axially concentrically grooved, manually. guided tool-lever fulcruined on said-pivot, said pivot entering into agroovein the tool-.

lever.

7 In apparatus for shaping thin rotating metal dies by pressure, the combination, with a frame for carrying the rotating body to be shaped, of a manualLpresser-lever fulcrumedon the frame, a manually guided resser-lever, and a tool detachably mounted in the end of the tool-lever. 1

8. In apparatus for shaping thin rotating by pressure, the combination with a frame for carrying the rotating body to be shaped and a suitably mounted elastie name to this specification in the presence of support fgrdsupporting t1l1)e free ede of the two witnesses. rotating 0 y against vi ration, 0 a suitably supported manual presser lever and a HERMANN RAHN' 5 manually guided tool lever fulcrurned on the Witnesses:

presser lever. HENRY HABPEB,

In testimony whereof, I have signed my WOLDEMAR HAUPT. 

